1. MYCIN is an expert system for treating blood infections.
2. MYCIN would attempt to diagnose patients based on reported symptoms
and medical test results.
3. Its job was to determine the nature of disease and recommend treatment for certain
blood infections.
4. MYCIN represented its knowledge as a set of IF-THEN rules with certainity factors.
5. 0.7 is roughly the certainity that the conclusion will be true,given the evidence.
6. MYCIN was written in LISP and its rule are formally represented as LISP
expression.
7. MYCIN is a goal -directed system,using the basic backward chaining
reasoning strategy.
8. Useful for junior or non specialized doctors.
9. Never actually used in practice due to ethical and legal issues related to the use of
computers in medicine.
It has following organizational features-
1. Knowledge Representation : Production rules implemented in LISP.
2. Reasoning : Background chaining, goal driven reasoning , uses
certainity factors to reason with uncertain information.
3. Heuristic : MYCIN examines each candidate diagnosis in a depth first manner.
Heuristic are used to limit the search , including checking all premise of a possible
rule to see if any one of these is known to be false.
4. Dialog explanation : It is computer controlled. Explanations are generated by
tracing back through the rules which have been triggered.Both "how" and "why"
explanations are supported.
2. MYCIN would attempt to diagnose patients based on reported symptoms
and medical test results.
3. Its job was to determine the nature of disease and recommend treatment for certain
blood infections.
4. MYCIN represented its knowledge as a set of IF-THEN rules with certainity factors.
5. 0.7 is roughly the certainity that the conclusion will be true,given the evidence.
6. MYCIN was written in LISP and its rule are formally represented as LISP
expression.
7. MYCIN is a goal -directed system,using the basic backward chaining
reasoning strategy.
8. Useful for junior or non specialized doctors.
9. Never actually used in practice due to ethical and legal issues related to the use of
computers in medicine.
It has following organizational features-
1. Knowledge Representation : Production rules implemented in LISP.
2. Reasoning : Background chaining, goal driven reasoning , uses
certainity factors to reason with uncertain information.
3. Heuristic : MYCIN examines each candidate diagnosis in a depth first manner.
Heuristic are used to limit the search , including checking all premise of a possible
rule to see if any one of these is known to be false.
4. Dialog explanation : It is computer controlled. Explanations are generated by
tracing back through the rules which have been triggered.Both "how" and "why"
explanations are supported.
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